Hi Guys,

I need some help and hope to learn something new in the process. I have a small CNC machine shop and specialize in CNC milling. I have a job requiring some compression springs made from wire with an oval, I think, cross section, that I will farm out to a shop that specializes in springs. I have searched all the on line calculators but none consider oval wire shape. I would suppose that spring makers have software to spit out the data, but I would like to know the answer to learn something new and to check the finished part when I order them. They have to be made to strict MIL specs with supporting data sheets but I want to be able to at least do some size measurements as incoming inspection. I want to check the oval size with digital calipers as a reference. Your help is much appreciated.
Thanks,
Mike

SPRING DATA:
MATERIAL: CHROME VANADIUM STEEL AISI 6150 OR CHROME SILICONE STEEL ASTM-A401
FREE LENGTH = 2.90/3.10
OD = 1.250 DIA REF
ID = .630/.690 DIA
SOLID LENGTH = 1.56 REF
ACTIVE COILS = 8
TOTAL COILS = 10
SPRING RATE = 512 LBS/IN
ENDS GROUND SQUARE WITHIN 5 DEGREES
DIRECTION OF HELIX = OPTIONAL
LOAD AT COMPRESSED LENGTH OF 2.500 = 256 LBS +/-20 LBS
STRAIN RELIEVE PER MIL-S-6715
COLD SET TO SOLID HEIGHT
CADMIUM PLATE